serial: fsl_lpuart: Fix comment typo

stable inclusion
from stable-v5.10.177
commit ae12308c7d5516891e616bdddfe20a303ac5b2d8
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I88YNP

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=ae12308c7d5516891e616bdddfe20a303ac5b2d8



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[ Upstream commit 374e01fa ]

The double `as' is duplicated in the comment, remove one.

Signed-off-by: Jason Wang <wangborong@cdjrlc.com>
Link: https://lore.kernel.org/r/20220803104208.4127-1-wangborong@cdjrlc.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Stable-dep-of: 1be6f2b1 ("tty: serial: fsl_lpuart: fix race on RX DMA shutdown")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>